Hoist



Feb. 19, 1952 MILLER 2,586,369

HOIST Filed NOV. 3, 1948 2 SHEETS-SHEET 2 FIG-2 INVENTOR. PERRY E. MILLER ATTORNEYS Patented Feb. 19, 1952 HOIST Perry Miller, Cleveland Heights, Ohio, assignor to The Lexington Supply Company, Cleveland, Ohio, a corporation of Ohio Application November 3, 1948, Serial No. 58,093 2 Claims. (01. 212 61) The invention relates to a portable hoisting crane of novel and improved structure. It is particularly adapted for use in building construction and repair work, and in such use it is normally positioned on intermediate floors or on the roof, for hoisting tools, construction materials, etc., from the ground level to the location of use. In preferred embodiment the crane is therefore of the fixed radius, circle swing type.

An object of the invention is to provide a crane of the character described which can be easily and quickly assembled and disassembled, the parts being readily carried from place to place by one workman.

A further object of the invention is to provide a crane such as defined in the last preceding paragraph, in which most of the structural elements can be formed from standard rolled or extruded structural shapes, such as tubing of circular or rectangular cross sectional contour made from aluminum or magnesium, or alloys of these non-ferrous metals.

Other objects and advantages will be apparent from a study of the following specification, in

conjunction with the accompanying drawings, in

which:

Fig. 1 is a top plan view of my hoisting crane;

Fig. 2-is aside elevational view of the crane, and r Fig. 3 is a front elevational view of the crane.

Before the invention here involved is specifically described, it is to be understood that the present invention is not limited to the details of construction and/or the specific arrangement of parts herein illustrated and/or described as the invention obviously may take other forms. It also is to be understood that the phraseology or terminology herein employed is for the purpose of description and not of limitation, the scope of the present invention being indicated by the appended claims.

Referring now to the drawings, the crane comprises a tubular mast I I, telescopingly inserted in a tubular socket l2 fixed to an elongated base member I3. The mast and socket in the embodiment illustrated are of hollow circular cross section, and the base member is also formed from hollow tubing but rectangular in cross section to provide a fiat surface contact with the supporting floor or roof.

Preferably all elements of the crane above described and to be described are formed from light, non-ferrous alloys such as the strong alloys of aluminum and magnesium base, which lend themselves readily to mechanical fabrication processes such as rolling and extrusion, and which are markedly lower in specific gravity than are the ferrous alloys, so that the finished crane can be readily moved either as a unit, or after disassembly. Angularly inclined braces I4 are welded at their respectively opposed ends to the socket I2 and the base I3. The lower end of the socket I2 is likewise Welded to the base, and the mast II is slidingly insertable into, or removable from, the socket.

At its rear, the mast II is supported by a trail member I5 of tubular character, which at its upper end telescopingly receives a spur I6 fixed to the top of the mast II, and at its lower end telescopingly receives a curved foot I1. Both the spur and the foot may be fixedly attached to the trail member in any conveniently removable fashion, such as by set screws, bolts, or the like. A roll of roofing material, or any other convenient counterweight, may be disposed in the curve of foot I1.

The trail member may be and here is pivotally, angularly adjustable with respect to the mast by forming the Spur in two parts, mutually pivoted at I8. At an intermediate height a horizontal link I9 is pivotally attached at its right end (Fig. 2) to a ring clamp 20 on mast II, and near its left end it is pivotally and adjustably fixed to trail member I5 in the following manner:

A swivel connector member 22 comprises two short sections of tubing mutually pivotally attached to each other, one section 22a adapted to slidably travel on trail member I5, and the other section 22b adapted to receive link I 9. Link I9 is provided with a row of spaced perforations 23, and section 221) is perforated to receive a stop pin 24 insertable through aligned perforations in section 22b and link I9, so that the angularity between mast II and trail member I5 is adjustably predeterminable. It is obvious of course that in the position shown in Fig. 2, the lower surfaces of foot I! and base I3 are .in the same horizontal plane, and that a change in the position of the swivel connector by moving it laterally to the right Or left on link I9 would respectively raise or lower the foot I! with respect to base I3. Assuming a flat supporting surface, this would result in tilting of the mast II out of vertical alignment, but if the supporting surface happens to be sloping, or of uneven or stepped character, the swivel joint connector can be laterally moved to maintain vertical alignment of mast II.

A pair of boom supporting brackets 25 and 26 are fixedly attached to mast II. Bracket 25 is here shown as welded to the top of the mast, but obviously it could be anywhere adjacent the top. Bracket 26 is shown at an intermediate height on the mast. A tubular boom 21 at its lower end has a removable pivotal connection with bracket 26, and as here shown this consists of a pin 28 on bracket 26 insertable into a. fitted aperture in a projection 29 fixed to the lower end of the boom. Obviously the pin could be on the boom, and the aperture could be in the bracket.

A jib brace 32 is welded at its outer end to the boom and at its inner end is provided with a pin-and-hole pivotal connection 33 to bracket 25. The terminology boom and jib. brace as arbitrarily applied to the respective members 21 and 32 may be reversed, if desired, since actually both members stifien and support each other, and both members swing as a unit to perform the functions of a fixed radius boom.

The tip portion 34 of the boom assembly is provided with a U,shaped bracket, 35 for the convenient attachment thereto of a pulley or other hoisting device.

Pin, 28 on bracket 26, and the pin of connection 33 between the, jibv brace 32,. and the bracket 25, may be threaded to. receive retaining nuts to hold the boom assembly from accidental dislodgement. Ring 29 may be slidable on mast H,

and may be fixed in any desired, position by a set screw.

It will be, readily apparent that the portable crane I have shown and describedcan be rapidly asembledialld disassembled, The boom assembly can be lifted off its supporting pivot pins, the mast can be removed fromv socket l2, and link I9. can be. slipped out of swivel connector 22 so as to jack knifev trail member 15 against. the mast. It. desirable, or necessary some of the elements can be subjected. to still. further disassembly by removal of? variousbolts and set screws.

What I claim is:

1. A crane comprising a base, a socket fixed to and extending upwardly from said base, a mast having a lower end portion telescopingly removably. insertable. into said socket, a trail member secured. 130.2111 extending angularly downwardly from a point adjacent the top end of said mast, said trail-:member being provided at itslower end withan upwardly curved foot adapted to receive and retain-a counterweight, a link rod having one end thereof connected to said mast at an inter.- mediate height. on said mast and having a. connection towards the other end thereof with said trail member at an intermediate height on said trail member, one of the last two said connections being a pivotal one, a boom pivotally connected to said mast on the opposite side of the mast from said trail member, and a jib brace fixed to said boom adjacent the free end of the boom, said jib brace being likewise pivotally connected to said mast at a point spaced from the pivotal connection of said boom and said mast, whereby said boom is adapted to swing in a circle of fixed radius with said mast as a center.

2. A crane comprising a base, a socket fixed to and extending upwardly from said base, brace means fixed to said socket near the upper end thereof and to said base at a point removed from the junction of the socket and the base, a mast having a lower end portion telescopingly insertable into said socket, a trail member secured to and extending angularly downwardly from a point adjacent thetop endv of. said mast, said trail member being provided at its lower end withv an upwardly curved foot adapted to receive and re. tain a counterweight, a link rod having one end thereof connected tosaid mast at an intermediate height on said mast, pivotal, connector means connecting said rod with said trail member at an intermediate height on saidtrail member, aboom pivotally connectedv to said mast on the opposite side of the mast from said trail member, and a jib brace fixed to said boom adjacent the free end of the boom, said jib. brace being likewise pivotally connected to said mast at a point. spaced from the pivotal connection of said boom and said mast, whereby said boom is adapted to swing in a circle of fixedradius withsaid mast as a center.

PERRY E. MILLER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,106,847 Root Aug. 11, 1914 1,322,256 Makos Nov. 18, 1919 1,977,723 Hall Oct. 23, 1934 2,109,304 Ormsby Feb. 22, 1938 2,305,202 Smith Dec. 15, 1942 2,373,743 Clifford Apr. 17, 1945 2,379,599 Smith July 3, 1945 

